'First born' in the Bible

And Canaan begot Zidon his firstborn, and Heth,

These are their generations: the firstborn of Ishmael, Nebaioth; and Kedar, and Adbeel, and Mibsam;

The sons of Judah: Er, and Onan, and Shelah: which three were born to him of the daughter of Shua the Canaanitess. And Er, Judah's firstborn, was wicked in the sight of Jehovah; and he slew him.

and Jesse begot his firstborn Eliab, and Abinadab the second, and Shimea the third,

And the sons of Jerahmeel the firstborn of Hezron were: Ram the firstborn, and Bunah, and Oren, and Ozem, of Ahijah.

And the sons of Ram, the firstborn of Jerahmeel, were Maaz, and Jamin, and Eker.

And the sons of Caleb the brother of Jerahmeel were Mesha his firstborn, who was the father of Ziph; and the sons of Mareshah the father of Hebron.

These are the sons of Caleb. The sons of Hur, the firstborn of Ephratah: Shobal the father of Kirjath-jearim,

And these are the sons of David, who were born to him in Hebron: the firstborn, Amnon, of Ahinoam the Jizreelitess; the second, Daniel, of Abigail the Carmelitess;

And the sons of Josiah: the firstborn Johanan, the second Jehoiakim, the third Zedekiah, the fourth Shallum.

and Penuel the father of Gedor, and Ezer the father of Hushah: these were the sons of Hur, the firstborn of Ephratah, and father of Bethlehem.

And the sons of Reuben the firstborn of Israel (for he was the firstborn; but, inasmuch as he defiled his father's bed, his birthright was given to the sons of Joseph the son of Israel; but the genealogy is not registered according to the birthright,

the sons of Reuben, the firstborn of Israel: Enoch And Phallu, Hezron And Carmi.

And the sons of Samuel: the firstborn Vashni and Abijah.

And Benjamin begot Bela his firstborn, Ashbel the second, and Aharah the third,

And his son, the firstborn, was Abdon; and Zur, and Kish, and Baal, and Nadab,

And the sons of Eshek his brother were Ulam his firstborn, Jeush the second, and Eliphelet the third.

And of the Shilonites: Asaiah the firstborn, and his sons.

And Mattithiah of the Levites, who was the firstborn of Shallum the Korahite, was in trust over the things that were made in the pans.

And his son, the firstborn, was Abdon, and Zur, and Kish, and Baal, and Ner, and Nadab,

And Meshelemiah had sons: Zechariah the firstborn, Jediael the second, Zebadiah the third, Jathniel the fourth,

And the sons of Obed-Edom: Shemaiah the firstborn, Jehozabad the second, Joah the third, and Sacar the fourth, and Nethaneel the fifth,

And Hosah, of the sons of Merari, had sons: Shimri the head, for though he was not the firstborn, yet his father made him the head;